(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[19]KM[0.00]
PW[백 JungHwan Park(9P)]PB[흑 WeiXing Tang(9p)]C[2014 Samsung cup semi final 1st game.
5th November , 2014
Black - Tang wei Xing 9p . China
White -  Park jung hwan 9p. Korea
Tang won the Samsung cup last year, winning against Lee Sedol in the finals.

The semi finals is a best of three.
This is the first game.
]
;B[qd]
;W[dp]
;B[pq]
;W[dd]
;B[fc]
;W[cf]
;B[lc]
;W[qn]
;B[qp]
;W[pj]
;B[qh]
;W[on]
;B[mp]C[This is a popular opening.

In this case white can consider 4 options.
There are two general directions of play: the top, or the right side.]
(;W[hc]C[The game. Also a good move on the upper side, but more tight.]
(;B[pl]C[What is the meaning of this move?
]
(;W[ql]C[The natural move.]
(;B[db]LB[fe:A]C[We saw that jumping out at A instead was not good, this is a better strategy]
;W[cc]
;B[ed]
;W[gd]C[An interesting move. This puts black under pressure. Black needs to be careful!

]
(;B[de]C[This was the game and it was an overplay. Tang Weixing probably misread something.
]
;W[ee]C[A strong move. And the only move.]
;B[ce]
;W[df]LB[gd:A]C[When white played A in the game, black thought for a few minutes. .. about 3 min. And then white cut in only a few seconds.
They both had great fighting spirit, but black made a mistake.
]
;B[bd]
;W[ec]C[Another sharp move.]
;B[fd]
;W[fe]
;B[fb]
;W[cb]
(;B[bf]C[That's why Tang sacrificed the top and played here]
;W[eb]C[White was happy to capture the top]
;B[cg]C[Now white is quite ahead in the game.
]
;W[od]
;B[ib]
;W[gb]
;B[qf]
;W[fq]
;B[jq]
(;W[ck]C[The game.]
;B[qk]
;W[pk]
(;B[ol]
(;W[rk]C[Therefore Park JungHwan played here in the game.]
;B[qm]
;W[rl]
;B[rm]
;W[pm]
;B[rn]
(;W[ri]C[This was the proper move.
Now white is still ahead.]
(;B[nk]C[Black played this kosumi in the game. ]
(;W[me]C[Park regretted this move.]
(;B[pc]C[But immediately afterwards, Tang also played a move he regretted.]
;W[ke]
;B[lf]
;W[le]
;B[nb]
;W[mn]
;B[ll]
;W[kn]
(;B[jm]C[This was too much, it forced black to come back in this area a few moves later and to take gote.]
;W[kp]
;B[kq]
;W[jp]
;B[lp]
;W[ip]
;B[iq]
;W[hp]
(;B[km]C[Black had to come back to defend the cutting point and got gote.
It introduces some aji in white's position]
(;W[op]LB[nn:A]C[This move helps a bit against the wedge at A]
;B[oq]
;W[dg]
;B[ch]
;W[dh]
;B[ci]
;W[di]
;B[cj]
;W[dk]
;B[dj]
;W[ej]
;B[ek]
;W[fj]
;B[bk]
;W[bl]
;B[aj]
;W[cm]C[White is still leading the game, by about komi. On top of that white has more potential in the center.]
;B[cq]
;W[cp]
;B[hj]
(;W[gl]C[This move was a slack move. Park Jung Hwan pointed out after the game that this move was almost the losing move. 
]
;B[gk]
;W[fk]
;B[hl]
;W[gm]C[After these exchanges, black settled his weak group in the center. And in sente. Black even got the chance to play in the lower left corner first.
]
;B[hm]
(;W[lo]
;B[er]LB[hq:A]C[A big move that complicated the game. Note that this is possible because white did not get the move at A.]
(;W[fr]C[White goes all out and tries to kill the corner.]
;B[dq]
;W[bp]
;B[bq]
(;W[aq]C[White goes for the kill, but it's too much. It backfired and cost white the game.]
;B[ar]
;W[bs]C[White plays a local killing move. This is a famous life and death shape. But it was overplay. 
There were too many weak points  in white's shape. 
]
(;B[eq]C[The move that complicated everything. Note that trying to live locally won't work for black.]
;W[ds]
;B[es]
;W[cr]LB[en:A][gn:B]C[Locally a famous dead shape. But black had too much aji in the A and B area.]
;B[fp]
;W[gq]
;B[ep]
(;W[go]C[This was the last losing move.]
;B[gn]
;W[fn]
;B[hr]
;W[fs]
;B[hn]
;W[fo]
;B[gp]
;W[hq]
;B[ho]LB[gp:B][hp:A]C[When black cuts here a semeai appears between the group at A and B]
;W[br]
;B[ap]
;W[eo]
;B[bo]
;W[do]
;B[aq]
;W[lq]
;B[mq]
;W[lr]
;B[mr]
(;W[nn]C[Now white is winning the capturing race by just one liberty!

But this means that white will have to play inside his own territory many times to capture the black group. It is still a success for black.]
;B[dr]
;W[cs]
;B[cn]
;W[dn]
;B[fm]
(;W[an]
;B[bn]
;W[bm]
;B[fl]
;W[el]
;B[mm]
;W[ln]
;B[jo]
;W[ko]
;B[jd]C[After the entire fight in the lower left corner, although white killed black by one liberty, black is winning. 
Black got benefits; he decreased white's territory, became very strong with what used to be his weak group in the center and also took sente.

The fate of black and white changed in an instant.
The game reversed completely. Whereas white was leading before, black is now leading by over 10 points. Game over.


]
;W[pe]
;B[qe]
;W[rh]
;B[rg]
;W[lh]
;B[bc]
;W[bb]
;B[og]
;W[ng]
;B[nh]
;W[mg]
;B[ki]
;W[ih]
;B[ic]
;W[hi]
;B[if]
;W[ij]
;B[jg]
;W[of]
;B[ji]
;W[gj]
;B[hk]
;W[ii]
;B[kg]
;W[oh]
;B[pg]
;W[ni]
;B[oi]
;W[oj]
;B[ph]
;W[nj]
;B[ea]
;W[dc]
;B[mi]
;W[li]
;B[mj]
;W[lj]
;B[mk]
;W[mh]
;B[pi]
;W[oh]
;B[as]
;W[cs]
;B[nh]
;W[qi]
;B[ok]
;W[oh]
;B[em]
;W[dm]
;B[nh]
;W[qj]
;B[kk]
;W[oh]
;B[gf]
;W[gc]
;B[nh]
;W[kf]
;B[lg]
;W[oh]
;B[fg]
;W[jk]
;B[kj]
;W[he]
;B[gh]
;W[gi]
;B[nh]
;W[mf]
;B[ne]
;W[mc]
;B[nc]
;W[nd]
;B[ig]
;W[mb]
;B[ld]
;W[md]
;B[ie]
;W[oh]
;B[ei]
;W[am]
;B[nh]
;W[na]
;B[ob]
;W[oh]
;B[ao]
;W[eh]
;B[nh]
;W[pf]
;B[qg]
;W[oh]
;B[fh]
;W[fi]
;B[nh]
;W[qb]
;B[pb]
;W[oh]
;B[ef]
;W[be]
;B[ae]
;W[cd]
;B[be]
;W[ik]
;B[nh]
;W[rc]
;B[rd]
;W[oh]
;B[eg])
(;W[fl]C[White can not rescue the two stones.]
;B[bm]
;W[am]
;B[an]
;W[al]
;B[dm]
;W[cl]
;B[em]C[White collapses.]))
(;W[bn]C[This is not good.]
;B[nn]C[The vital point ]))
(;W[gn]C[Playing here would make things more complicated.

Now black started boyomi
But white still had over 30 minutes on the clock. This could have turned things around.
]
;B[en]C[If black finds this move however, white can't kill black nevertheless. 
Black's group is flexible.There are some interesting sequences here.]
(;W[do]
;B[eo]
(;W[el]C[Like this it's easy for black to make the second eye.]
;B[gp]
;W[hq]
;B[go]
;W[hn]
;B[fn])
(;W[go]C[When white defends here the result will be a semeai]
;B[el]
;W[dm]
;B[em]
;W[bn]
;B[ap]
;W[ao]
;B[hr]
;W[fs]
;B[fl]LB[kn:A]C[Black cuts the group at A off. And actually this capturing race is favourable for black. Black wins it.
]))
(;W[dn]
;B[el]
;W[em]
;B[fm]
;W[dm]
;B[fn]
;W[fl]C[Again black can make the second eye easily.]
;B[go]
;W[hn]
;B[gp]
;W[hq]
;B[eo]C[almost same.])
(;W[eo]C[This crazy looking move is a sharp idea. But black can manage.]
;B[do]
(;W[fo]C[This is too easy for black.]
;B[go]
;W[fn]
;B[gp])
(;W[dn]C[A better move.]
(;B[fo]C[This is what white wants.]
;W[dm]
;B[hr]
;W[gr]
;B[ho]
;W[go]
;B[gp]
;W[hq]
;B[io]
;W[ir]
;B[jr]
;W[hs]
;B[fs]
;W[np]C[W's intention. White will make life.]
;B[nq]
;W[lq]
;B[lr]
;W[mo]
;B[mq]
;W[gs])
(;B[dm]C[This is the right move for black. ]
;W[co]
;B[el]
;W[fn]
;B[em]
(;W[cl]
;B[fo]
;W[do]
;B[ap]
(;W[hn]C[Defending this cut will result in a huge ko on the left side.]
;B[bn]
;W[cn]
;B[al]
;W[am]
;B[bm]C[A ko.])
(;W[ao]C[Defending the left side will allow black to cut the center off.]
;B[bn]
;W[cn]
;B[bo]
;W[bm]
;B[an]
;W[am]
;B[hn]
;W[go]
;B[gp]
;W[hq]
;B[ho]
;W[fl]
;B[hr]C[Black is winning the capturing race.]))
(;W[fo]
;B[bn]
;W[cn]
;B[cl]LB[bm:A][gp:B]C[A and B are miai.]
(;W[bm]
;B[gp]
;W[hq]
;B[hn]C[Again the liberty race that white can't win.])
(;W[hn]
;B[bm]C[Black takes a lot of points, in sente.]
;W[ap]
;B[hr]
;W[fs]C[White kills the corner, but lost too many points while doing so. Black still has sente. Good for black.])))))))
(;B[cr]
;W[eq]
(;B[es]
;W[cs]C[Black dies.])
(;B[fs]
;W[gs]
;B[ds]C[A two step ko]))
(;B[ds]
;W[eq]C[Black dies.])
(;B[es]C[Also not good, black can't live.]
;W[cr]))
(;W[eq]C[Instead, white should play here. This makes the corner into a ko. If white plays here, the game is still difficult for both. 
]
;B[es]C[White has 2 ways to make a ko.]
(;W[cs]
;B[bs]
;W[br]
;B[ar]
;W[as])
(;W[aq]
;B[ar]
;W[bs]
;B[cs]
;W[cr]
;B[dr]
;W[ds])))
(;W[dq]C[Tang's opinion was that white should have blocked here.
This is safe.
However, white does lose a lot of points. And Park felt dissatisfied with this idea.
That's why Park tried to kill the corner!
]
;B[gr]))
(;W[hq]SQ[cq]C[White should defend here and remove the aji in the corner.
It completely kills the marked stone]
;B[gn]C[Black can damage white's territory a bit, but this would be enough for white.]
(;W[hn]C[Note that white can not cut here.]
;B[in]
;W[ho]
;B[lo]
;W[ln]
;B[ko]C[White is cut.])
(;W[fn]C[White has to play from this side.]
;B[go]LB[lo:A]C[After this extension, black is looking forward to cutting at A again. So white needs to defend.]
;W[in]C[But white can defend in an active way.
White is okay.])))
(;W[hk]C[This would be proper.]
;B[ik]
;W[hl]
;B[ij]
;W[hq]C[The winning sequence.
If white plays like this, white can't lose the game.])
(;W[ik]C[Another option, a fierce move. This fight is also favourable for white.]
;B[hk]
;W[il]))
(;W[dg]C[When white plays tenuki..]
;B[nn]C[This move is hard to answer for white]
;W[no]
;B[ln]
;W[lo]
;B[mo]
;W[lm]
;B[nm]C[White has been cut]))
(;B[dg]
;W[km]
;B[kl]
;W[jl]C[White would cut here when black does not defend])
(;B[ik]C[Usually this would be the way to defend the cutting point more actively]))
(;B[jl]C[This move is better.
This keeps the initiative in black's hands.]
;W[kp]
;B[kq]
;W[jp]
;B[lp]
;W[ip]
;B[dg]))
(;B[ke]C[Tang agreed that he should have jumped into the center.]))
(;W[pe]C[After the game the players discussed that this sequence would be better for white.]
;B[qe]
;W[pc]
;B[qc]
;W[qb]
;B[rb]
;W[le]C[These white moves are disturbing black's connection. Black's group is blocked off on the side and needs to survive.]))
(;B[nm]C[You may wonder: why didn't black capture these white stones?]
;W[mo]C[Actually, because of this move, white can still escape.]
;B[no]
;W[nn]
;B[mn]
;W[mm]C[There is too much aji still.]))
(;W[nk]C[Again this doesn't work. Black can escape.]
;B[nl]
;W[ml]
;B[nm]C[White is split.]))
(;W[rl]C[This would be an overplay. Black will split white into two weak groups.]
;B[qj]
;W[pi]
;B[qi]
;W[nk]
;B[nl]
;W[ml]
;B[nm]LB[qn:A]C[Black can't be captured, and white's group at A is in trouble.]))
(;B[qm]C[Playing atari first doesn't work for black.]
(;W[pm]C[White can squeeze.]
;B[rl]
;W[ol]C[This is ok for white.])
(;W[rl]C[Note that white can't extend here.]
;B[ol]LB[qj:B][rm:A]C[This move makes miai of going through at A or connecting at B.])))
(;W[pm]C[White can also defend here to get rid of all the aji. White is leading so white can play safe.]))
(;B[dc]C[Note that cutting like this does not work. This was most likely Tang Weixing's misreading. He didn't see one special move before starting this fight.]
;W[cd]
;B[be]
;W[bc]
;B[bf]
;W[bg]
;B[cg]
;W[bh]
;B[ch]
(;W[ci]C[When white plays here, black will win the game.]
;B[ef]
;W[dg]
;B[dh]
;W[eg]
;B[di]
;W[cj]
;B[ff]
;W[ge]
;B[fg]C[The ladder is good for black. So white has a terrible result.])
(;W[dh]C[This move however changes the whole situation. Probably Tang Weixing overlooked it or didn't consider it.
]
;B[ci]
;W[af]C[Now white wins the capturing race.])))
(;B[ef]C[jumping is not good]
;W[dc]
;B[ec]
;W[cb]C[It is hard to find a good continuation for black now]
;B[gg]
;W[kd]
;B[ld]
;W[kf]
;B[le]
;W[fe]
;B[ee]
;W[ff]C[There is still a cut here])
(;B[ee]C[Therefore black is supposed to play like this.]
(;W[dc]C[When white now plays the same sequence, it is a bit different]
;B[ec]
;W[cb]
;B[dg]
;W[df]
;B[ef]
;W[eg]
;B[fg]
;W[eh]
;B[gf]
;W[kd]
;B[ld]
;W[ke]
;B[fi]C[A fight follows])
(;W[eg]C[This move seems like white is attacking black's group. But actually, if black can find the proper response, black will have a good result.
]
(;B[fg]C[This leaves black with bad shape.]
;W[ef]
;B[ff]
;W[fe]C[White aims to cut!])
(;B[ge]C[Black gets bad shape again.]
;W[he]
;B[gf]
;W[hf]C[White is pushing from behind, but..]
;B[gg]
;W[hg]
;B[gh]C[Good for white.]
;W[ii]
;B[gj]
;W[od]C[White grasps the initiative.])
(;B[ef]C[This is a very good move.]
(;W[fg]C[Looks normal, but the result will be terrible for white.]
;B[ce]
;W[de]
;B[df]
;W[dg]
;B[cd]
;W[dc]
;B[bc]
;W[cb]
;B[bf]
;W[cg]
;B[bb]
;W[eb]
;B[ec]
;W[da]
;B[ba]
;W[ca]
;B[fb]C[White dies.])
(;W[dg]C[The proper move.]
(;B[gf]C[A good move.]
;W[fg]
;B[ge]
;W[kd]
;B[ld]
;W[ke]
;B[le]
;W[kf]
;B[jc]C[However this is quite a success for black. Black is taking away white's base and feels comfortable])
(;B[fg]C[Also good.]
;W[fh]
;B[gf]
;W[gh]
;B[id]C[Black attacks white on the vital point.]
;W[he]C[Note that black's move makes it very difficult for white to move out.]
;B[hd]C[Black can cut.]
;W[ge]
;B[gc]C[Very good for black.])
(;B[ce]C[Note that in the fighting to come, black always has this move in reserve. This can be played in sente and is big aji.]
;W[de]
;B[df]
(;W[be]
;B[cg]
;W[bf]LB[ch:A]C[Black can potentially cut white by playing at A.])
(;W[bf]C[White can not defend like this]
;B[cg]
;W[ch]
;B[be]
;W[bg]
;B[cd]
;W[dc]
;B[bc]
;W[cb]
;B[bb])))))))
(;
(;W[rj]LB[pl:1][ql:2]C[With this exchange of black 1 for white 2, the move on the second line for white afterwards becomes less interesting, because it leaves aji in the position. ]
(;B[qm]C[Black has aji here...])
(;B[qk]LB[rj:A]C[Or here. So white will have to look at other defending moves instead of A.]))
(;W[pm]LB[rj:C][pl:A][ql:B]C[This defending move will become more natural for white instead.

Therefore the exchange of black A for white B decreased the chance that white will play at C later.])))
(;AE[pl]LB[pl:A]C[If black doesn't play at A...]
;W[rj]LB[qf:B][pl:A]C[Without the black stone at A. White will defend here, aiming at B]
;B[pl]SQ[rj]C[When black plays this move now, with the marked stone in place]
(;W[ql]C[White will probably not answer submissively here.])
(;W[ol]C[But instead attack!])))
(;B[fe]C[This is not good for black, it's white's intention!]
;W[ec]
;B[fb]
;W[he]
;B[fg]
;W[hg]
(;B[fi]
;W[di]C[Too easy for white.])
(;B[dh]C[This is a better move for black than jumping out. 
When black plays here, white should be careful to find the right move!]
(;W[gi]C[White would like to play here, but playing it immediately is too hasty. This is a mistake.]
;B[cc]
(;W[ef]C[Playing here now comes too late, black will not answer.]
;B[eb]SQ[fg][dh]C[Black takes a huge corner. An eventhough white can cut off the black marked stones, they are flexible. ]
;W[ff]
;B[cl]C[Black will jump here.]
;W[cn]
;B[el]C[Black is out of danger.])
(;W[eb]
;B[cd]
;W[de]
;B[be]
;W[bf]
;B[db]SQ[dd][de][cf]C[Black makes life and white's marked group became weak.]))
(;W[ef]C[White should peep here first! It is crucial to defend the corner. Now, black can't get a good result.]
;B[ff]
;W[gi]TR[ef]C[The △ move is an important exchange. Black now has little aji in the corner.
]
;B[cc]
;W[eb]
;B[cd]
;W[ce]LB[fg:A]C[White is ok. Black's group at A is under pressure.
Black might be able to live in the corner, but it will hurt the outside.
He has no time to live in the corner.]))))
(;W[rj]LB[qf:C][pl:B][ql:A]C[This move is the most peaceful move of the 4. It strengthens white's base on the right side.
Invasion moves like A or B for black are now defended against. Also, white's move aims to invade at C more easily later.])
(;W[qf]C[Another possible move on the right side.
This move is the most difficult amongst the 4 and complicates the game immediately. ]
(;B[pe]C[Black pressures the white stone.]
;W[pf]
(;B[oh]C[Jumping here for black will result in a running fight.]
;W[of]
;B[od]C[Note this beautiful shape move of black to attack white and solidify the corner.]
;W[qj]LB[rh:A]C[Complicated fighting. White takes away black's base and also aims to connect underneath with A.])
(;B[of]C[Also possible]
(;W[ph]C[A normal looking move, but it is slack.]
;B[pg]
;W[qg]
;B[og]
;W[qi]
;B[rh]
;W[ri]
;B[oh]
;W[pi]
;B[fe]LB[rd:A]C[This result is good for black.
These days White doesn't play like this anymore.

Note that white can not clamp at A anymore in this position.]
;W[rd]C[This clamp comes too late.]
;B[qe]C[Black can cut.])
(;W[rd]C[This is an interesting timing move.
It has a clever meaning.]
(;B[rc]C[Answering here for black feels normal, but it's too good for white.]
;W[re]
;B[pc]
;W[ph]
;B[pg]
;W[qg]
;B[og]
;W[qi]C[Enough for white.
If we compare this to the previous diagram, we can see that white gained about 10 points.]
;AE[pc][rc][rd][re]AW[pi][ri]AB[oh][rh]LB[rd:A]C[This was the previous diagram. Like we saw, white can not play at A anymore, so this is much worse for white.])
(;B[og]C[That's why black has to play here.]
;W[qe]
;B[pd]
;W[rc]
;B[qb]
;W[rb]
;B[fe]C[This is an even result.]))))
(;B[qj]C[Also possible. 
Like this black will get territory on the right side and white will invade the top.]
;W[qk]
;B[pi]
;W[rj]
;B[qi]C[An ugly move, white has no time to defend though]
;W[qc]C[And invades the corner.. A testing move.]
;B[pc]
;W[pd]
;B[qb]
;W[rc]
;B[pe]
;W[od]
;B[qe]
;W[oe]
;B[pf]
(;W[of]C[This is not sente, so it is a mistake for white.]
;B[ob]
;W[pg]
;B[qg]C[Black got the right side and the top.])
(;W[nb]C[White has to play here.]
(;B[pb]
;W[rb]
;B[ra]
;W[kc]LB[lb:A][ld:B]C[This is, surprisingly, a common variation.
White creates a sort of miai of connecting above at B or underneath at A])
(;B[ob]C[Also possible, from a pro-game: https://badukmovies.com/pro_games/47852-lian-xiao-lee-donghoon?move=21]
;W[oc]
;B[pb]
;W[mc]
;B[rb]
;W[ld]
;B[kc]
;W[kd]
;B[ic]))))
(;W[id]C[Instead of playing on the right side, invading the top is also good direction.]
(;B[fe]C[Jumping here is a bit too much.]
;W[ig]
;B[fg]
;W[od]C[This is white's intention. Black has 3 thin positions and feels a bit busy.])
(;B[od]LB[qf:A]C[So, black usually answers by securing the upper right corner. Note that this also protects against the invasion at A.])))
